Silencer for printing telegraph apparatus



Aug. 1, 195o R. F. VEE 2,517,147

SILENCER FOR PRINTING TELEGRAPH APPARATUS `Filed Sept. 30, 1948 2 Sheets-Sheet 2 INVENTOR RICHARD F. VEE

BYZM;

ATTORNEY FIG. 3

Patented Aug. 1, 1950 SILENCER FOR PRINTING TELEGRAPH APPARATUS Richard F. Vee, Chicago, Ill., assignor to Teletype Corporation, Chicago, Ill., a corporation of Delaware Application September 30, 1948, Serial No. 52,077

This invention relates to printing telegraph apparatus and more particularly to mechanism for silencing a telegraph printer.

There has been considerable effort directed towards the silencing of printing telegraph apparatus. There are two main directions in which such effort has been applied. First, telegraph printers have been designed to include a minimum number of moving parts which provide the source of most of the noise connected with prin@ ing telegraphy. Second, it has been proposed to house the printers in soundproof cabinets or in soundproof rooms. Obviously, with a machine which necessarily must be as complicated as a telegraph printer, it is only possible to reduce the noise to a certain point and it is impractical to make the printer itself silent. Therefore, it is but natural to enclose the printer in some'type of a silencing cabinet.

When telegraph printers have been placed in soundproof rooms they have been very effectively silenced, however, it is bothersome for an operator to continually enter a separate room in order to pick up telegraph copy. Therefore, perhaps the greatest efforts have been expended towards the design of an eiTective-soundproof cabinet. It is a comparatively easy matter to com-r pletely enclose a telegraph printer in a small cabinet and thereby silence it; however, difficulties have been encountered in providing for the continuous withdrawal of a Work sheet or the copy from within such a cabinet Without destroying the effectiveness of the cabinet as a silencer. Numerous attempts have been made to seal off the paper exit slot except for the protruding paper or work sheet, but in doing this it becomes almost a necessity that means be provided outside the printer for positively withdrawing the work sheet or strip. Naturally this is expensive.

It has been found that the noise actually escaping from the cabinet through the air space in the paper exit slot of a soundproof telegraph printer cabinet is practically nil, and that nearly all of the noise escaping results from vibrations induced in the paper strip, the vibrations travelling to the outside of the cabinet along the paper strip.

The principal object of the present invention is therefore to provide means for damping the vibrations induced in the work sheet or paper strip by a telegraph printer prior to the exit of such strip from a silencing cabinet.

Other objects and advantages of the inven- 7 claims. (C1. 17a- 42) tion will appear from the following detailed description when read in conjunction with the accompanying drawings wherein:

Fig. l is a side elevational View of a telegraph silencing cabinet partly cut away to show more clearly the principal features of the invention;

Fig. 2 is a detail view of the apparatus for dampening vibrations induced in a work sheet; and

Fig. 3 is another detail view of the vibration dampening means.

In the drawings a cabinet I I is lined with suitable soundproong insulating material I2. The top central portion of the cabinet I I is cut away as shown and has a glass viewing plate I3 therein. The viewing plate I3 is hinged to the cabinet and is mounted so as to provide a paper exit slot I4. Mounted suitably within the cabinet Il is a telegraph printer I6, the printer having a cylindrical platen I'I around which a work sheet or paper strip I8 travels. Suitable means (not shown, such as rollers) are provided for maintaining the paper strip I8 in engagement with the platen I1. The printer I 6 is also provided with a plurality of type bars, represented by a single type bar I9, all of which are adapted to strike against the paper strip I3 as it travels around the platen I'I in order to cause intelligence to be printed on the paper. After the paper I8 travels around the platen Il, and after having received intelligence thereon, the paper travels through the slot or paper exit |74 to the outside of the cabinet I I.

A pair of brackets 2| are secured suitably to the printer I6 and support a plate 22 by means of bolts 23. A pair of brackets 24 are secured suitably to the plate 22 and each support pivotally an arm 26 by means of a bolt 21. The arms 26 are urged clockwise about the bolts 21 by means of springs 28. The arms 26 support, parallel to the platen II, a rotatable shaft 29 which carries a plurality of discs or rollers 3I. The effect of the springs 28 is to continuously urge the rollers 3| towards the platen. The plate 22 has a pair of projections 32 which support a rotatable shaft 33 parallel to the platen I'I. Mounted on the shaft 33 are a plurality of discs or rollers 34. The rollers 3| are spaced uniformly along the shaft 29 and the rollers 34 are spaced uniformly along the shaft 33 midway between the rollers 3 I.

Turning to Figs. 1 and 3 it is apparent that the two sets of rollers 3| and 34 overlap one another slightly. The paper strip I8, as it leaves the platen I 1, passes between the two sets of rollers 3| and 34 and due to the overlap between the two sets of rollers the paper strip I8 is wrinkled longitudinally slightly. When one of the type bars I9 strike the paper I8 while against the platen I1, considerable vibration is set up in the paper. These vibrations are known as type chatter. When the paper I8 extends out of the cabinet II the type chatter is transferred along the paper. However, when the paper I8 is wrinkled longitudinally by the two sets of rollers 3l and 34 the type chatter is reduced to a minimum due to the damping of the vibrationsinthe paper I8. The noise normally transferredA bythe paper strip I8 is, therefore, effectively reduced.

By the present invention ythere is ,provided a very efficient mechanism for minimizing the noise from telegraph printers or other printing machines having means for striking ,awork sheetrto impress intelligence thereon. Theinvention has been described in connection with a single operative embodiment but it is to be understood that modications may-readily occur to ,those skilled in the art without departingfrompthe spiritfor scope' ofV the invention.

Whatis claimed is:

1. In an apparatus forsilencingtelegraph: apparatus, a soundproofing vcabinet for `enclosing thetelegraph apparatus, said soundprooiing cabinet having a paper exit, a plurality of type pallets-in said=telegraph apparatus'fonprinting intelligence on a paper strip, andfmeans-mounted within said cabinet forw-rinkling saidgpaper strip prior to passing throughsa-id exit, whereby vibrations induced in the paper bypsaid type `pallets striking are dampened.

2. In an yapparatus for silencing telegraph apparatus, a cabinet for enclosing Ya telegraph printer, said cabinetbeing ,effective `to dampen noise from saidprinter and having-a paper lexit therein, a plurality of .type pallets insaid printer for printing intelligencefonfagpaper strip, and a wrinkler for dampening vibrations induced in said paper strip by said type pallets topreventchat tering in said paperfstripafterpassing through said paper exit. i

3. .'Ihe combination vof a cylindrical platen, meansfor supporting afwork sheet againstfsaid platen, and a pair of sets of discs for longitudinally wrinklingv said work sheet to dampen vibrationsinduced therein when type pallets strike vsaid Work sheet while against said platen.

4. In an apparatus for silencing telegraph printers, a substantially soundproof cabinet for housing a telegraph printer, said cabinet having a paper exit slot, and means mounted on said printer for Wrinkling longitudinally a paper advancing through said printer to prevent vibrations having'been setup in said paperabyfsaid printer from continuing in said .paper :after passing through said paper exit slot.

5. In an apparatus for silencing telegraph printers, a substantially soundproof cabinet for .housing a ytelegraph printer, said printer having a plurality of type bars for printing intelligence ona paper strip,v said', cabinet having a paper exit, and a pair of sets of rollers secured to said printer and being positioned such that said paper strip having `received intelligence thereon is directed between said sets of rollers and longitudinally wrinkled thereby to dampen vibrations set up in said paper strip by said type bars prior to the exit ofsaidpaperstrip through saidfpaper exit.

6- In .combination with =a-.te1e graphprinter. having a rotatable platen, means forvradvancing a paper. strip around -saidl platen aI pluralityr of type pallets Yfor ,printing intelligence on said paper strip by :striking -said ,i paper strip 'whiley against said platen, `and a .pair of v-sets .of overlapping rollers for -wrinklingsaidpaper strip longitudinally .to dampen-vibrationsset` up thereinby said type i pallets Iwhen striking.-said paper strip whi1e againstsaidfplaten..

-7. In ranl apparatus for 1 printing :intelligence on a work -sheet,:printing: means fcrstriking a-Work sheet .to-impress .intelligence thereon, and agpair of sets of cooperating overlapping rollers for wrinkling `,said Work sheet ,subsequent to theim pression of yintelligence :thereon f by said printing means in order to.` .suppress noise induced in.` said work sheet by the striking thereof-byfsaidprinting means. l

REFERENCES :CITED The following references :are :of '.record'in thel file of -zthis patentz y 1#UNID'IIETJ "STATES PATENTS Number .Name Date .RICHARD F. (VEEL Certicate of Correction Patent No. 2,517,147 August 1, 1950 RICHARD F. VEE

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows:

Column 8, line 34, after the Word striking insert thereagaz'nst;

and that the said Letters Patent should be read as corrected above, so that the same [SEAL] THOMAS F. MURPHY,

Assistant ommz'sszoner of Patents.

Certcate of Correction Patent No. 2,517,147 August 1, 1950 RICHARD F. VEE

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows:

Column 3, line 34, after the Word striking insert t/iereagainst;

and that the said Letters Patent should be read as corrected above, so that the same may Conform to the record of the ease in the Patent Oce.

Signed and sealed this 21st day o1 November, A. D. 1950.

[SEAL] THOMAS F. MURPHY,

Assistant Commissioner of Patents. 

